ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCCCCCCCC%5BC%40H%5D1%5BC%40H%5D%28O1%29CCCCC%28C%29C/file?format=sdf&get3d=True -- CCCCCCCCCC%5BC%40H%5D1%5BC%40H%5D%28O1%29CCCCC%28C%29C could not be loaded.